This 13.5 oz shaker bottle with 304 stainless steel ball is a great promotional item for anyone promoting health. Perfect for protein shakes and smoothies! The ball designed to break up the powder particles while shaking. Contains a large mouth for easy drinking. Perfect for healthy lifestlyes, active lifestyles, gyms, or fitness centers. We are very strict with quality control and have skilled teams working on printing. All protein water bottle material we used including the colour powder are food safety grade.